JP2019533176A - Prism-type augmented reality display device - Google Patents

Abstract

A prism-type augmented reality display device capable of reducing the chromatic aberration of a virtual image and improving the sharpness of a superimposed image viewed by a user. A prism-type augmented reality display device according to the present invention includes an LCOS display chip, a polarizing beam splitter (PBS), a two-piece cemented lens, a first single lens, which are sequentially arranged along a first axis. A beam splitter; and an LCOS illumination device provided on a second axis orthogonal to the first axis and close to the PBS. The negative lens of the two-piece cemented lens is close to the PBS, the positive lens is close to the first single lens, the first light incident surface of the beam splitter is close to the first single lens, and the light The axis overlaps the optical axis of the first single lens, the optical axis of the second light incident surface of the beam splitter is perpendicular to the optical axis of the first light incident surface, and the second light incident surface is Opposite the light exit surface. When using the prism-type virtual reality display device according to the present invention, the user can not only see an image in which the virtual image and the real world are superimposed, but also reduce the chromatic aberration of the virtual image. [Selection] Figure 2

Description

"Cross-reference of related applications"
The present application incorporates by reference the entire patent application entitled “Prism AR Display Device” of Chinese Patent Application No. 2017108478856 filed on September 19, 2017.

  The present invention relates to augmented reality technology, and more particularly to a prism-type augmented reality display device.

  Augmented Reality Technology (“Augmented Reality”, hereinafter referred to as “AR”) refers to a technology that calculates a position and an angle when a camera takes a picture in real time and adds related images, video, and a 3D model. In such a technique, the virtual information can be superposed on the real world scene, thereby fusing the real world and the virtual image.

  In order to allow a user to see an image in which a virtual image and the real world are superimposed, the AR technique generally requires an imaging technique and a separation / condensing technique. In the conventional prism type AR display device, the imaging optical path and the separation / condensing optical path are realized by one beam splitter, so that the virtual image viewed by the user has a large chromatic aberration and the sharpness is low.

  An object of the present invention is to provide a prism-type AR display device that can reduce the chromatic aberration of a virtual image and increase the sharpness of a superimposed image viewed by a user.

  The present invention provides the following prism type AR display device. That is, an LCOS display chip, a polarizing beam splitter (PBS), a two-piece cemented lens, a first single lens, a beam splitter, and a second orthogonal to the first axis, which are sequentially arranged along the first axis. An LCOS illuminating device provided on an axis and close to the PBS, wherein the two-piece cemented lens includes a positive lens close to the first single lens and a negative lens close to the PBS, and the beam The first light incident surface of the splitter is close to the first single lens, and its optical axis overlaps with the optical axis of the first single lens, and the optical axis of the second light incident surface of the beam splitter is The LCOS illumination device is arranged so that the LCOS display device emits virtual image light so that the second light incident surface is opposite to the first light exit surface and the LCOS illumination device emits virtual image light. The virtual image light emitted from the LCOS display chip passes through the PBS, is refracted by the two-piece cemented lens, is incident on the first single lens, and is refracted by the first single lens. The light is incident on the beam splitter, and is combined with the ambient light from the second light incident surface of the beam splitter at the first light incident surface of the beam splitter, and is transmitted through the first light exit surface of the beam splitter to the user's eyes. Incident.

  The first single lens may be a positive lens.

  An antireflection film may be coated on the first light incident surface and / or the second light incident surface.

  The polarizing element further includes a polarizing element, the polarizing element is positioned on the light exit side of the second light exit surface of the beam splitter, the polarization direction of the polarization element is orthogonal to the polarization direction of the PBS, and the second light exit surface is It is good also as a structure facing the said 1st light-incidence surface.

  Furthermore, the first light incident surface and / or the second light incident surface may be concave.

  Further, the beam splitter includes a first prism and a second prism that are sequentially arranged, and the slope of the first prism and the slope of the second prism are joined to form a separation surface of the beam splitter. Therefore, a semi-transmissive reflective film is coated on the cemented surface, and a surface of the first prism that is close to the first single lens and whose optical axis overlaps with the optical axis of the first single lens is the first incident light. A surface of the first prism whose optical axis is orthogonal to the optical axis of the first single lens is the first light exit surface, and the optical axis of the second prism is the optical axis of the first single lens. The surface orthogonal to the optical axis may be the second light incident surface.

  Further, the beam splitter includes a second prism and a first prism that are sequentially arranged, and the slope of the second prism and the slope of the first prism are joined to form a separation surface of the beam splitter. Therefore, a semi-transmissive reflective film is coated on the cementing surface, and the surface of the second prism that is close to the first single lens and whose optical axis overlaps the optical axis of the first single lens is the first incident light. The surface of the second prism whose optical axis is orthogonal to the optical axis of the first single lens is the second light incident surface, the second light incident surface is a convex surface, and is semi-transmissive. A surface coated with a reflective film and having an optical axis perpendicular to the optical axis of the first single lens in the first prism may be the first light exit surface.

  Furthermore, the first light exit surface may be a concave surface that is concentric with the second light incident surface and has the same radius of curvature.

  Furthermore, the LCOS illumination device includes a concave and convex lens and a light source device sequentially arranged along the second axis, and the first surface of the concave and convex lens adjacent to the light source device is a concave spherical surface, The adjacent second surface is a convex spherical surface, and the light emitted from the light source device is condensed on the PBS through the concave-convex lens, and is polarized by the PBS and incident on the LCOS display chip as vertical linearly polarized light. It is good also as composition to do.

  Further, the LCOS illumination device includes an aspherical positive lens provided on the second axis and positioned between the concave / convex lens and the PBS, and the aspherical positive lens is refracted by the concave / convex lens. The light emitted from the light source device may be uniformly refracted to reach the PBS, polarized by the PBS, and incident on the LCOS display chip.

  In the prism-type AR display device according to the present invention, the imaging optical path includes a two-piece cemented lens and a first single lens that are sequentially arranged coaxially, and the separation / condensing optical path is realized by a beam splitter. In such an optical path design, the two-piece cemented lens forms an image of the virtual image light emitted from the LCOS display chip, and corrects the chromatic aberration generated in the image forming optical path and the separation / condensing optical path, thereby enabling the virtual image. Therefore, the sharpness of the superimposed image viewed by the user can be increased.

1 is a schematic structural diagram of a prism type AR display device according to the prior art. 1 is a schematic structural diagram of a prism type AR display device according to an embodiment of the present invention; FIG. FIG. 6 is a schematic structural diagram of a prism type AR display device according to another embodiment of the present invention. It is a schematic structure figure of LCOS lighting equipment in one example of the present invention. FIG. 5 is a schematic structural diagram of a prism type AR display device according to a further embodiment of the present invention;

  In order to clarify the objects, technical solutions and advantages of the present invention, the technical solutions of the present invention will be described in detail with reference to specific embodiments and drawings of the present invention.

  The exemplary embodiments of the present invention and related descriptions are provided to clarify the present invention and are not intended to limit the present invention. The described embodiments are only some but not all of the embodiments of the present invention. The drawings are used to deepen the understanding of the present invention and constitute the present invention. Based on the embodiments of the present invention, all other embodiments that can be conceived by those skilled in the art without creative work belong to the technical scope of the present invention.

  As shown in FIG. 1, in the imaging optical path of a conventional prism type AR display device, virtual image light reflected by an LCOS (Liquid Crystal on Silicon) display chip passes through a polarization beam splitter (PBS). The light enters the splitter and passes through the transflective film of the beam splitter. Then, the light is imaged by the reflecting surface of the beam splitter, and is combined with the ambient light reflected by the semi-transmissive reflecting film and enters the user's eyes. In the above optical path, the imaging optical path and the separation / condensing optical path are realized by one beam splitter. Since light having different wavelengths included in the virtual image light has a difference in dispersion and refractive index in the beam splitter, light having different wavelengths included in the virtual image light is imaged at different positions. As a result, the virtual image viewed by the user has a large chromatic aberration and low definition. The embodiment of the present invention provides a prism type AR display device shown in the following drawings in order to eliminate such a drawback.

  FIG. 2 is a schematic structural diagram of a prism type AR display device according to an embodiment of the present invention. As shown in FIG. 2, the AR display device includes an LCOS display chip 100, a polarization beam splitter (PBS) 101, a two-piece cemented lens 102, and a first single lens 103 that are sequentially arranged along a first axis. And a beam splitter 104 and an LCOS illumination device 105 provided on a second axis orthogonal to the first axis and close to the PBS 101. In some cases, the first axis and the second axis are orthogonal to the light incident surface of the PBS 101, pass through the geometric center of the PBS 101, and are orthogonal to each other.

  The two-piece cemented lens 102 may be configured by cementing a positive lens made of low dispersion crown glass and a negative lens made of high dispersion flint glass. The negative lens in the two-piece cemented lens 102 is close to the PBS 101, and the positive lens is close to the first single lens 103. The double-junction lens 102 eliminates chromatic aberration generated in the optical path, and can refract light having a large divergence angle transmitted through the PBS 101 and propagate it as light having a small divergence angle, thereby improving the light collection efficiency of the AR display device. Can be increased.

  The first single lens 103 can be a positive lens. The first single lens 103 forms an image in combination with the two-piece cemented lens 102, and also contributes to the refractive power of the optical path system to improve the optical path structure. The first single lens 103 and the two-piece cemented lens 102 may be made of different materials. In other words, the first single lens 103 is not made of flint glass or crown glass, and thus, it is possible to further eliminate chromatic aberration generated in the optical path and to increase the sharpness of the virtual image viewed by the user.

  The beam splitter 104 includes two light incident surfaces, two light output surfaces, and one separation surface. The separation surface is constituted by, for example, a transflective film.

  As shown in FIG. 2, the first light incident surface Si <b> 1 of the beam splitter 104 is close to the first single lens 103, and the optical axis thereof overlaps with the optical axis of the first single lens 103. The optical axis of the second light incident surface Si2 of the beam splitter 104 is orthogonal to the optical axis of the first light incident surface Si1, and the second light incident surface Si2 faces the first light output surface Se1.

  The LCOS display chip 100 used in the embodiment of the present invention described later or later will be a display chip that cannot emit light, and it is necessary to illuminate with polarized light in order to display an image having different gradation and color. In the embodiment of the present invention, illumination for the LCOS display chip 100 is realized by combining the PBS 101 and the LCOS illumination device 105 to generate linearly polarized light. In the prism type AR display device shown in FIG. 2, the virtual image light emitted from the LCOS display chip 100 passes through the PBS 101, is refracted by the two-piece cemented lens 102, enters the first single lens 103, and the first single lens. 103 is refracted by the beam splitter 104 and enters the beam splitter 104. The first light incident surface Si1 of the beam splitter 104 is combined with the ambient light from the second light incident surface Si2 of the beam splitter 104, and the first light exit surface Se1 of the beam splitter 104 is It passes through and enters the user's eyes. Then, the user can see an image in which the virtual image and the real world are superimposed on the light output side of the first light output surface Se1.

  In the prism type AR display device according to the present embodiment, the imaging optical path includes a two-piece cemented lens 102 and a first single lens 103 which are sequentially arranged coaxially, and the separation / condensing optical path is realized by the beam splitter 104. The In such an optical path design, the two-piece cemented lens 102 forms an image of the virtual image light emitted from the LCOS display chip 100, corrects chromatic aberration generated in the image forming optical path and the separation / condensing optical path, and provides a virtual image. Accordingly, the sharpness of the superimposed image viewed by the user can be increased. In addition, the imaging optical path composed of the two-piece cemented lens 102 and the first single lens 103 includes a total of five optical surfaces having a specific radius of curvature, so that the imaging optical path has a sufficient viewing angle, The viewing angle can be adjusted according to the imaging requirements. Furthermore, the beam splitter 104 has a function of separation and condensing, and by using a parallel flat glass having a specific thickness as an equivalent structure, the structure of the AR display device can be improved by shortening the optical path.

  Further, as shown in FIG. 2, the beam splitter 104 may include a first prism 1041 and a second prism 1042 that are sequentially arranged. In order to join the slope of the first prism 1041 and the slope of the second prism 1042 and form a separation surface of the beam splitter 104, the joint surface is coated with a transflective film.

  In such a structure, the surface of the first prism 1041 that is close to the first single lens 103 and whose optical axis overlaps the optical axis of the first single lens 103 is the first light incident surface Si1. The surface of the first prism 1041 whose optical axis is orthogonal to the optical axis of the first single lens 103 is the first light exit surface Se1. The surface of the second prism 1042 whose optical axis is orthogonal to the optical axis of the first single lens 103 is a second light incident surface Si2.

  The virtual image light refracted by the first single lens 103 is incident on the separation surface through the first light incident surface Si1 of the first prism 1041, and is reflected by the first light exit surface Se1 of the first prism 1041 by the separation surface. At the same time, the ambient light enters the separation surface through the second light incident surface Si2 of the second prism 1042, passes through the separation surface, and reaches the first light exit surface Se1 of the first prism 1041. Then, the user can see an image in which the virtual image and the real world are superimposed on the light output side of the first light output surface Se1.

  In the above process, since the virtual image light refracted by the first single lens 103 reaches the user's eyes only once through the separation surface of the beam splitter 104, the light efficiency is 50%. On the other hand, in the optical path shown in FIG. 1, since the virtual image light passes through the separation surface of the beam splitter twice, the light efficiency is only 25%. Therefore, compared with the prior art, the present invention can greatly increase the light efficiency in the image formation process of the virtual image, so that the user can not only view the virtual image with the same brightness but also illuminate the LCOS display chip 100. It is possible to reduce the energy required for the LCOS lighting equipment.

  As shown in FIG. 3, the beam splitter 104 may include a second prism 1042 and a first prism 1041 that are sequentially arranged. In order to join the slope of the second prism 1042 and the slope of the first prism 1041 and form a separation surface of the beam splitter 104, the joint surface is coated with a transflective film.

  The surface of the second prism 1042 that is close to the first single lens 103 and whose optical axis overlaps the optical axis of the first single lens 103 is a first light incident surface Si1. The surface of the second prism 1042 whose optical axis is orthogonal to the optical axis of the first single lens 103 is the second light incident surface Si2, the second light incident surface Si2 is a convex surface, and the transflective film is coated. Has been. The surface of the first prism 1041 whose optical axis is orthogonal to the optical axis of the first single lens 103 is the first light exit surface Se1.

  In such a structure, the virtual image light refracted by the first single lens 103 enters the separation surface through the first light incident surface Si1 of the second prism 1042, and the second light incident on the second prism 1042 by the separation surface. The light is reflected by the surface Si2, reflected by the second light incident surface Si2, reflected by the separation surface, passes through the separation surface, and reaches the first light exit surface Se1 of the first prism 1041. At the same time, the ambient light enters the separation surface through the second light incident surface Si2 of the second prism 1042, passes through the separation surface, and reaches the first light exit surface Se1 of the first prism 1041. Then, the user can see an image in which the virtual image and the real world are superimposed on the light output side of the first light output surface Se1.

  In the above process, since the second light incident surface Si2 is a convex surface and is coated with a semi-transmissive reflective film, the incident light beam can be collimated to form an enlarged image. Since the collimated virtual image light is more concentrated in energy, the sharpness of the virtual image viewed by the user can be increased.

  As shown in FIG. 3, in the above embodiment, the first light exit surface Se1 may be a concave surface concentric with the second light entrance surface Si2, and may have the same radius of curvature as the second light entrance surface Si2. . Here, since the thickness of the effective region of the beam splitter 104 is uniform, distortion of the ambient light can be reduced and the quality of the ambient light viewed by the user can be improved.

  The PBS 101 may be configured by joining a pair of high-precision right-angle prisms. Of these, the polarization separation film is coated on the inclined surface of one of the right-angle prisms, and the polarization separation film can divide incident non-polarized light into two linearly polarized lights orthogonal to each other. Of these, horizontally polarized light (P light) is completely transmitted, and vertically polarized light (S light) is reflected at an angle of 45 degrees. That is, the outgoing direction of S-polarized light and the outgoing direction of P-polarized light form an angle of 90 degrees.

  As shown in FIGS. 2 and 3, the LCOS display chip 100 and the LCOS illumination device 105 may be provided on both sides adjacent to the PBS 101. For example, the LCOS display chip 100 is provided on the first axis, and the LCOS illumination device 105 is provided on the second axis. The LCOS illumination device 105 includes a concavo-convex lens 1051 and a light source device 1052 that are sequentially arranged along the second axis.

  The non-polarized light having a large divergence angle emitted from the light source device 1052 first enters the concavo-convex lens 1051, and is refracted by the concavo-convex lens 1051 and enters the PBS 101 as a light beam having a small divergence angle. Polarized light is polarized by the polarization separation film of the PBS 101, and one linearly polarized light irradiates the LCOS display chip 100 to display an image having different gradation and color. In the embodiment of the present invention described above or later, virtual image light emitted from the LCOS display chip 100 should be understood as light reflected by the LCOS display chip 100 due to the above-described illumination process, and redundant description is omitted. To do.

  The first surface S11 of the concave / convex lens 1051 adjacent to the light source device 1052 is a concave spherical surface, and the second surface S12 spaced from the light source device 1052 is a convex spherical surface. When a light beam emitted from the light source device 100 enters S11, the light beam is refracted and incident on S12 as a light beam having a small angle. In order to guarantee the light collection efficiency, by making the surface S12 a substantially hemispherical convex spherical surface, the hole size of S12 is maximized in a state where the radius of curvature is determined, and the light flux of S12 is increased, and the light refracted by S11. Is propagated as much as possible. Further, S12 which is a convex spherical surface can reduce the divergence angle of the light beam emitted from the concave / convex lens 1051, and can limit the angle when the illumination spot is formed by reaching the LCOS display chip 100 within a reasonable range. In designing the concavo-convex lens 1051, the radius of curvature of S12 can be made twice the radius of curvature of S11.

  When the concave / convex lens 1051 is used in the LCOS illumination device 105 according to the above embodiment, high illumination efficiency can be realized. However, in some cases, the light emitted from the light source device 1052 is not uniform due to limitations due to the package structure of the light source device 1052, and the uniformity of the light irradiated within the display range of the LCOS display chip 100 is also reduced. In order to improve the uniformity of illumination for the LCOS display chip 100, the present invention further provides an LCOS illumination device shown in FIG. As shown in FIG. 4, the device further includes an aspheric positive lens 1053.

  The aspherical positive lens 1053 is positioned between the concave / convex lens 1051 and the PBS 101 and is installed coaxially with the concave / convex lens 1051. In this embodiment, the light emitted from the light source device 1052 is refracted by the concave / convex lens 1051 and enters the aspherical positive lens 1053 as light having a small divergence angle. The aspherical positive lens 1053 uniformly refracts the light emitted from the light source device 1052 refracted by the concave / convex lens 1051 and reaches the PBS 101. Then, it is polarized by the PBS 102 and enters the LCOS display chip 100.

  Note that the radius of curvature of the aspherical positive lens 1053 continuously changes with a specific specification from its center to the edge and has a positive refractive power. Therefore, by accurately controlling the direction of each outgoing light beam, The refracted light beam can reach a predetermined position on the target plane. Thereby, it can be guaranteed that the illumination spots of the LCOS display chip 100 are uniformly distributed.

  In the embodiment of the present invention described above or later, the first light incident surface Si1 and / or the second light incident surface Si1 may be coated with an antireflection film. When the antireflection film is coated on the first light incident surface Si1, the intensity of the virtual image light incident on the first light incident surface Si1 can be increased, and the virtual image viewed by the user can be made clearer. Similarly, when the antireflection film is coated on the second light incident surface Si2, the intensity of the ambient light incident on the second light incident surface Si2 can be increased, and the real world image seen by the user can be made clearer.

  In the above embodiment of the present invention, in order to enhance the light collecting ability of the first light incident surface Si1 and / or the second light incident surface Si1, both can be concave. For example, when the first light incident surface Si1 is a concave surface, even if the display area of the LCOS display chip 100 is increased, the first light incident surface Si1 has a high light collection rate for virtual image light emitted from the LCOS display chip 100. It can be propagated with.

  In the above-described or later-described embodiments of the present invention, the transflective film of the beam splitter 104 transmits a part of the virtual image light incident on the first light incident surface Si1 to the second light exit surface Se2 of the beam splitter 104. Can be reached. The second light exit surface Se2 is a surface facing the first light incident surface Si1 of the beam splitter 104. In some cases, since no shielding means is provided on the light exit side of the second light exit surface Se2, there is a possibility that the virtual image leaks and the user's privacy is violated.

  In order to eliminate the above defects, as shown in FIG. 5, the prism type AR display device of the present invention may further include a polarizing element 106. The polarizing element 106 is located on the light exit side of the second light exit surface Se2, and the polarization direction of the polarization element 106 is orthogonal to the polarization direction of the PBS 101. Accordingly, the polarizing element 104 removes the virtual image light after polarization transmitted through the second light exit surface Se2, thereby avoiding leakage of the virtual image seen by the user, protecting the user's privacy, and using experience Can be improved.

  The polarizing element 106 may be an optical element that separates from the beam splitter 104, for example, a polarizing plate. The polarizing element 106 may be designed integrally with the beam splitter. For example, by coating the second light exit surface Se2 of the beam splitter 104 with a polarizing film, the prism AR display device can be made more compact while quenching.

  The present invention provides a prism type AR display device based on the above embodiment. The present invention includes any prism type AR display device described in the above embodiments. The AR display device has advantages in that chromatic aberration during image formation is small, viewing angle is large, and light efficiency is high.

  In addition, terms such as “first” and “second” in the present specification are used to distinguish different optical elements and the like, and do not indicate the positional relationship of the optical elements in the optical path, but are of different types. It is not limited as.

The above embodiment is for explaining the technical solution means of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art can make modifications based on the technical solutions described in the above-described embodiments or equivalent replacements in some technical features. You can also go. It is obvious that these technical solutions do not depart from the technical idea and scope of the technical solutions according to the embodiments of the present invention by these modifications and substitutions.

"Cross-reference of related applications"
The present application incorporates by reference the entire patent application entitled “Prism AR Display Device” of Chinese Patent Application No. 2017108478856 filed on September 19, 2017.

  The present invention relates to augmented reality technology, and more particularly to a prism-type augmented reality display device.

  Augmented Reality Technology (“Augmented Reality”, hereinafter referred to as “AR”) refers to a technology that calculates a position and an angle when a camera takes a picture in real time and adds related images, video, and a 3D model. In such a technique, the virtual information can be superposed on the real world scene, thereby fusing the real world and the virtual image.

  In order to allow a user to see an image in which a virtual image and the real world are superimposed, the AR technique generally requires an imaging technique and a separation / condensing technique. In the conventional prism type AR display device, the imaging optical path and the separation / condensing optical path are realized by one beam splitter, so that the virtual image viewed by the user has a large chromatic aberration and the sharpness is low.

  An object of the present invention is to provide a prism-type AR display device that can reduce the chromatic aberration of a virtual image and increase the sharpness of a superimposed image viewed by a user.

The present invention provides the following prism type AR display device. That is, an LCOS display chip, a polarizing beam splitter (PBS), a two-piece cemented lens, a first single lens, a beam splitter, and a second orthogonal to the first axis, which are sequentially arranged along the first axis. An LCOS illuminating device provided on an axis and close to the PBS, wherein the two-piece cemented lens includes a positive lens close to the first single lens and a negative lens close to the PBS, and the beam The first light incident surface of the splitter is close to the first single lens, and its optical axis overlaps with the optical axis of the first single lens, and the optical axis of the second light incident surface of the beam splitter is The LCOS illumination device is arranged so that the LCOS display device emits virtual image light so that the second light incident surface is opposite to the first light exit surface and the LCOS illumination device emits virtual image light. The virtual image light emitted from the LCOS display chip passes through the PBS, is refracted by the two-piece cemented lens, is incident on the first single lens, and is refracted by the first single lens. The light is incident on the beam splitter, and is combined with the ambient light from the second light incident surface of the beam splitter at the separation surface of the beam splitter, passes through the first light exit surface of the beam splitter, and enters the user's eyes.

  The first single lens may be a positive lens.

  An antireflection film may be coated on the first light incident surface and / or the second light incident surface.

  The polarizing element further includes a polarizing element, the polarizing element is positioned on the light exit side of the second light exit surface of the beam splitter, the polarization direction of the polarization element is orthogonal to the polarization direction of the PBS, and the second light exit surface is It is good also as a structure facing the said 1st light-incidence surface.

  Furthermore, the first light incident surface and / or the second light incident surface may be concave.

  Further, the beam splitter includes a first prism and a second prism that are sequentially arranged, and the slope of the first prism and the slope of the second prism are joined to form a separation surface of the beam splitter. Therefore, a semi-transmissive reflective film is coated on the cemented surface, and a surface of the first prism that is close to the first single lens and whose optical axis overlaps with the optical axis of the first single lens is the first incident light. A surface of the first prism whose optical axis is orthogonal to the optical axis of the first single lens is the first light exit surface, and the optical axis of the second prism is the optical axis of the first single lens. The surface orthogonal to the optical axis may be the second light incident surface.

  Further, the beam splitter includes a second prism and a first prism that are sequentially arranged, and the slope of the second prism and the slope of the first prism are joined to form a separation surface of the beam splitter. Therefore, a semi-transmissive reflective film is coated on the cementing surface, and the surface of the second prism that is close to the first single lens and whose optical axis overlaps the optical axis of the first single lens is the first incident light. The surface of the second prism whose optical axis is orthogonal to the optical axis of the first single lens is the second light incident surface, the second light incident surface is a convex surface, and is semi-transmissive. A surface coated with a reflective film and having an optical axis perpendicular to the optical axis of the first single lens in the first prism may be the first light exit surface.

  Furthermore, the first light exit surface may be a concave surface that is concentric with the second light incident surface and has the same radius of curvature.

  Furthermore, the LCOS illumination device includes a concave and convex lens and a light source device sequentially arranged along the second axis, and the first surface of the concave and convex lens adjacent to the light source device is a concave spherical surface, The adjacent second surface is a convex spherical surface, and the light emitted from the light source device is condensed on the PBS through the concave-convex lens, and is polarized by the PBS and incident on the LCOS display chip as vertical linearly polarized light. It is good also as composition to do.

  Further, the LCOS illumination device includes an aspherical positive lens provided on the second axis and positioned between the concave / convex lens and the PBS, and the aspherical positive lens is refracted by the concave / convex lens. The light emitted from the light source device may be uniformly refracted to reach the PBS, polarized by the PBS, and incident on the LCOS display chip.

  In the prism-type AR display device according to the present invention, the imaging optical path includes a two-piece cemented lens and a first single lens that are sequentially arranged coaxially, and the separation / condensing optical path is realized by a beam splitter. In such an optical path design, the two-piece cemented lens forms an image of the virtual image light emitted from the LCOS display chip, and corrects the chromatic aberration generated in the image forming optical path and the separation / condensing optical path, thereby enabling the virtual image. Therefore, the sharpness of the superimposed image viewed by the user can be increased.

1 is a schematic structural diagram of a prism type AR display device according to the prior art. 1 is a schematic structural diagram of a prism type AR display device according to an embodiment of the present invention; FIG. FIG. 6 is a schematic structural diagram of a prism type AR display device according to another embodiment of the present invention. It is a schematic structure figure of LCOS lighting equipment in one example of the present invention. FIG. 5 is a schematic structural diagram of a prism type AR display device according to a further embodiment of the present invention;

  In order to clarify the objects, technical solutions and advantages of the present invention, the technical solutions of the present invention will be described in detail with reference to specific embodiments and drawings of the present invention.

  The exemplary embodiments of the present invention and related descriptions are provided to clarify the present invention and are not intended to limit the present invention. The described embodiments are only some but not all of the embodiments of the present invention. The drawings are used to deepen the understanding of the present invention and constitute the present invention. Based on the embodiments of the present invention, all other embodiments that can be conceived by those skilled in the art without creative work belong to the technical scope of the present invention.

  As shown in FIG. 1, in the imaging optical path of a conventional prism type AR display device, virtual image light reflected by an LCOS (Liquid Crystal on Silicon) display chip passes through a polarization beam splitter (PBS). The light enters the splitter and passes through the transflective film of the beam splitter. Then, the light is imaged by the reflecting surface of the beam splitter, and is combined with the ambient light reflected by the semi-transmissive reflecting film and enters the user's eyes. In the above optical path, the imaging optical path and the separation / condensing optical path are realized by one beam splitter. Since light having different wavelengths included in the virtual image light has a difference in dispersion and refractive index in the beam splitter, light having different wavelengths included in the virtual image light is imaged at different positions. As a result, the virtual image viewed by the user has a large chromatic aberration and low definition. The embodiment of the present invention provides a prism type AR display device shown in the following drawings in order to eliminate such a drawback.

  FIG. 2 is a schematic structural diagram of a prism type AR display device according to an embodiment of the present invention. As shown in FIG. 2, the AR display device includes an LCOS display chip 100, a polarization beam splitter (PBS) 101, a two-piece cemented lens 102, and a first single lens 103 that are sequentially arranged along a first axis. And a beam splitter 104 and an LCOS illumination device 105 provided on a second axis orthogonal to the first axis and close to the PBS 101. In some cases, the first axis and the second axis are orthogonal to the light incident surface of the PBS 101, pass through the geometric center of the PBS 101, and are orthogonal to each other.

  The two-piece cemented lens 102 may be configured by cementing a positive lens made of low dispersion crown glass and a negative lens made of high dispersion flint glass. The negative lens in the two-piece cemented lens 102 is close to the PBS 101, and the positive lens is close to the first single lens 103. The double-junction lens 102 eliminates chromatic aberration generated in the optical path, and can refract light having a large divergence angle transmitted through the PBS 101 and propagate it as light having a small divergence angle, thereby improving the light collection efficiency of the AR display device. Can be increased.

  The first single lens 103 can be a positive lens. The first single lens 103 forms an image in combination with the two-piece cemented lens 102, and also contributes to the refractive power of the optical path system to improve the optical path structure. The first single lens 103 and the two-piece cemented lens 102 may be made of different materials. In other words, the first single lens 103 is not made of flint glass or crown glass, and thus, it is possible to further eliminate chromatic aberration generated in the optical path and to increase the sharpness of the virtual image viewed by the user.

  The beam splitter 104 includes two light incident surfaces, two light output surfaces, and one separation surface. The separation surface is constituted by, for example, a transflective film.

  As shown in FIG. 2, the first light incident surface Si <b> 1 of the beam splitter 104 is close to the first single lens 103, and the optical axis thereof overlaps with the optical axis of the first single lens 103. The optical axis of the second light incident surface Si2 of the beam splitter 104 is orthogonal to the optical axis of the first light incident surface Si1, and the second light incident surface Si2 faces the first light output surface Se1.

The LCOS display chip 100 used in the embodiment of the present invention described later or later will be a display chip that cannot emit light, and it is necessary to illuminate with polarized light in order to display an image having different gradation and color. In the embodiment of the present invention, illumination for the LCOS display chip 100 is realized by combining the PBS 101 and the LCOS illumination device 105 to generate linearly polarized light. In the prism type AR display device shown in FIG. 2, the virtual image light emitted from the LCOS display chip 100 passes through the PBS 101, is refracted by the two-piece cemented lens 102, enters the first single lens 103, and the first single lens. 103 is refracted by 103 and enters the beam splitter 104, and is combined with the ambient light from the second light incident surface Si <b> 2 of the beam splitter 104 at the separation surface of the beam splitter 104, and passes through the first light exit surface Se <b> 1 of the beam splitter 104. Incident in the eyes. Then, the user can see an image in which the virtual image and the real world are superimposed on the light output side of the first light output surface Se1.

  In the prism type AR display device according to the present embodiment, the imaging optical path includes a two-piece cemented lens 102 and a first single lens 103 which are sequentially arranged coaxially, and the separation / condensing optical path is realized by the beam splitter 104. The In such an optical path design, the two-piece cemented lens 102 forms an image of the virtual image light emitted from the LCOS display chip 100, corrects chromatic aberration generated in the image forming optical path and the separation / condensing optical path, and provides a virtual image. Accordingly, the sharpness of the superimposed image viewed by the user can be increased. In addition, the imaging optical path composed of the two-piece cemented lens 102 and the first single lens 103 includes a total of five optical surfaces having a specific radius of curvature, so that the imaging optical path has a sufficient viewing angle, The viewing angle can be adjusted according to the imaging requirements. Furthermore, the beam splitter 104 has a function of separation and condensing, and by using a parallel flat glass having a specific thickness as an equivalent structure, the structure of the AR display device can be improved by shortening the optical path.

  Further, as shown in FIG. 2, the beam splitter 104 may include a first prism 1041 and a second prism 1042 that are sequentially arranged. In order to join the slope of the first prism 1041 and the slope of the second prism 1042 and form a separation surface of the beam splitter 104, the joint surface is coated with a transflective film.

  In such a structure, the surface of the first prism 1041 that is close to the first single lens 103 and whose optical axis overlaps the optical axis of the first single lens 103 is the first light incident surface Si1. The surface of the first prism 1041 whose optical axis is orthogonal to the optical axis of the first single lens 103 is the first light exit surface Se1. The surface of the second prism 1042 whose optical axis is orthogonal to the optical axis of the first single lens 103 is a second light incident surface Si2.

  The virtual image light refracted by the first single lens 103 is incident on the separation surface through the first light incident surface Si1 of the first prism 1041, and is reflected by the first light exit surface Se1 of the first prism 1041 by the separation surface. At the same time, the ambient light enters the separation surface through the second light incident surface Si2 of the second prism 1042, passes through the separation surface, and reaches the first light exit surface Se1 of the first prism 1041. Then, the user can see an image in which the virtual image and the real world are superimposed on the light output side of the first light output surface Se1.

  In the above process, since the virtual image light refracted by the first single lens 103 reaches the user's eyes only once through the separation surface of the beam splitter 104, the light efficiency is 50%. On the other hand, in the optical path shown in FIG. 1, since the virtual image light passes through the separation surface of the beam splitter twice, the light efficiency is only 25%. Therefore, compared with the prior art, the present invention can greatly increase the light efficiency in the image formation process of the virtual image, so that the user can not only view the virtual image with the same brightness but also illuminate the LCOS display chip 100. It is possible to reduce the energy required for the LCOS lighting equipment.

Further, as shown in FIG. 2 , the beam splitter 104 may include a second prism 1042 and a first prism 1041 that are sequentially arranged. In order to join the slope of the second prism 1042 and the slope of the first prism 1041 and form a separation surface of the beam splitter 104, the joint surface is coated with a transflective film.

  The surface of the second prism 1042 that is close to the first single lens 103 and whose optical axis overlaps the optical axis of the first single lens 103 is a first light incident surface Si1. The surface of the second prism 1042 whose optical axis is orthogonal to the optical axis of the first single lens 103 is the second light incident surface Si2, the second light incident surface Si2 is a convex surface, and the transflective film is coated. Has been. The surface of the first prism 1041 whose optical axis is orthogonal to the optical axis of the first single lens 103 is the first light exit surface Se1.

  In such a structure, the virtual image light refracted by the first single lens 103 enters the separation surface through the first light incident surface Si1 of the second prism 1042, and the second light incident on the second prism 1042 by the separation surface. The light is reflected by the surface Si2, reflected by the second light incident surface Si2, reflected by the separation surface, passes through the separation surface, and reaches the first light exit surface Se1 of the first prism 1041. At the same time, the ambient light enters the separation surface through the second light incident surface Si2 of the second prism 1042, passes through the separation surface, and reaches the first light exit surface Se1 of the first prism 1041. Then, the user can see an image in which the virtual image and the real world are superimposed on the light output side of the first light output surface Se1.

  In the above process, since the second light incident surface Si2 is a convex surface and is coated with a semi-transmissive reflective film, the incident light beam can be collimated to form an enlarged image. Since the collimated virtual image light is more concentrated in energy, the sharpness of the virtual image viewed by the user can be increased.

  As shown in FIG. 3, in the above embodiment, the first light exit surface Se1 may be a concave surface concentric with the second light entrance surface Si2, and may have the same radius of curvature as the second light entrance surface Si2. . Here, since the thickness of the effective region of the beam splitter 104 is uniform, distortion of the ambient light can be reduced and the quality of the ambient light viewed by the user can be improved.

  The PBS 101 may be configured by joining a pair of high-precision right-angle prisms. Of these, the polarization separation film is coated on the inclined surface of one of the right-angle prisms, and the polarization separation film can divide incident non-polarized light into two linearly polarized lights orthogonal to each other. Of these, horizontally polarized light (P light) is completely transmitted, and vertically polarized light (S light) is reflected at an angle of 45 degrees. That is, the outgoing direction of S-polarized light and the outgoing direction of P-polarized light form an angle of 90 degrees.

  As shown in FIGS. 2 and 3, the LCOS display chip 100 and the LCOS illumination device 105 may be provided on both sides adjacent to the PBS 101. For example, the LCOS display chip 100 is provided on the first axis, and the LCOS illumination device 105 is provided on the second axis. The LCOS illumination device 105 includes a concavo-convex lens 1051 and a light source device 1052 that are sequentially arranged along the second axis.

  The non-polarized light having a large divergence angle emitted from the light source device 1052 first enters the concavo-convex lens 1051, and is refracted by the concavo-convex lens 1051 and enters the PBS 101 as a light beam having a small divergence angle. Polarized light is polarized by the polarization separation film of the PBS 101, and one linearly polarized light irradiates the LCOS display chip 100 to display an image having different gradation and color. In the embodiment of the present invention described above or later, virtual image light emitted from the LCOS display chip 100 should be understood as light reflected by the LCOS display chip 100 due to the above-described illumination process, and redundant description is omitted. To do.

  The first surface S11 of the concave / convex lens 1051 adjacent to the light source device 1052 is a concave spherical surface, and the second surface S12 spaced from the light source device 1052 is a convex spherical surface. When a light beam emitted from the light source device 100 is incident on S11, the light beam is refracted and incident on S12 as a light beam having a small angle. In order to guarantee the light collection efficiency, by making the surface S12 a substantially hemispherical convex spherical surface, the hole size of S12 is maximized in a state where the radius of curvature is determined, and the light flux of S12 is increased, and the light refracted by S11 Is propagated as much as possible. Further, S12 which is a convex spherical surface can reduce the divergence angle of the light beam emitted from the concave / convex lens 1051, and can limit the angle when the illumination spot is formed by reaching the LCOS display chip 100 within a reasonable range. In designing the concavo-convex lens 1051, the radius of curvature of S12 can be made twice the radius of curvature of S11.

  When the concave / convex lens 1051 is used in the LCOS illumination device 105 according to the above embodiment, high illumination efficiency can be realized. However, in some cases, the light emitted from the light source device 1052 is not uniform due to limitations due to the package structure of the light source device 1052, and the uniformity of the light irradiated within the display range of the LCOS display chip 100 is also reduced. In order to improve the uniformity of illumination for the LCOS display chip 100, the present invention further provides an LCOS illumination device shown in FIG. As shown in FIG. 4, the device further includes an aspheric positive lens 1053.

The aspherical positive lens 1053 is positioned between the concave / convex lens 1051 and the PBS 101 and is installed coaxially with the concave / convex lens 1051. In this embodiment, the light emitted from the light source device 1052 is refracted by the concave / convex lens 1051 and enters the aspherical positive lens 1053 as light having a small divergence angle. The aspherical positive lens 1053 uniformly refracts the light emitted from the light source device 1052 refracted by the concave / convex lens 1051 and reaches the PBS 101. Then, the light is polarized by the PBS 101 and enters the LCOS display chip 100.

  Note that the radius of curvature of the aspherical positive lens 1053 continuously changes with a specific specification from its center to the edge and has a positive refractive power. Therefore, by accurately controlling the direction of each outgoing light beam, The refracted light beam can reach a predetermined position on the target plane. Thereby, it can be guaranteed that the illumination spots of the LCOS display chip 100 are uniformly distributed.

In the embodiment of the present invention described above or later, the first light incident surface Si1 and / or the second light incident surface Si2 may be coated with an antireflection film. When the antireflection film is coated on the first light incident surface Si1, the intensity of the virtual image light incident on the first light incident surface Si1 can be increased, and the virtual image viewed by the user can be made clearer. Similarly, when the antireflection film is coated on the second light incident surface Si2, the intensity of the ambient light incident on the second light incident surface Si2 can be increased, and the real world image seen by the user can be made clearer.

In the above embodiment of the present invention, in order to enhance the light collecting ability of the first light incident surface Si1 and / or the second light incident surface Si2 , both can be concave. For example, when the first light incident surface Si1 is a concave surface, even if the display area of the LCOS display chip 100 is increased, the first light incident surface Si1 has a high light collection rate for virtual image light emitted from the LCOS display chip 100. It can be propagated with.

  In the above-described or later-described embodiments of the present invention, the transflective film of the beam splitter 104 transmits a part of the virtual image light incident on the first light incident surface Si1 to the second light exit surface Se2 of the beam splitter 104. Can be reached. The second light exit surface Se2 is a surface facing the first light incident surface Si1 of the beam splitter 104. In some cases, since no shielding means is provided on the light exit side of the second light exit surface Se2, there is a possibility that the virtual image leaks and the user's privacy is violated.

  In order to eliminate the above defects, as shown in FIG. 5, the prism type AR display device of the present invention may further include a polarizing element 106. The polarizing element 106 is located on the light exit side of the second light exit surface Se2, and the polarization direction of the polarization element 106 is orthogonal to the polarization direction of the PBS 101. As a result, the polarizing element 106 removes the polarized virtual image light transmitted through the second light exit surface Se2, thereby preventing the virtual image seen by the user from leaking, protecting the user's privacy and using the user experience. Can be improved.

  The polarizing element 106 may be an optical element that separates from the beam splitter 104, for example, a polarizing plate. The polarizing element 106 may be designed integrally with the beam splitter. For example, by coating the second light exit surface Se2 of the beam splitter 104 with a polarizing film, the prism AR display device can be made more compact while quenching.

  The present invention provides a prism type AR display device based on the above embodiment. The present invention includes any prism type AR display device described in the above embodiments. The AR display device has advantages in that chromatic aberration during image formation is small, viewing angle is large, and light efficiency is high.

  In addition, terms such as “first” and “second” in the present specification are used to distinguish different optical elements and the like, and do not indicate the positional relationship of the optical elements in the optical path, but are of different types. It is not limited as.

  The above embodiment is for explaining the technical solution means of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art can make modifications based on the technical solutions described in the above-described embodiments or equivalent replacements in some technical features. You can also go. It is obvious that these technical solutions do not depart from the technical idea and scope of the technical solutions according to the embodiments of the present invention by these modifications and substitutions.

Claims (10)

A prism-type augmented reality display device,
An LCOS display chip, a polarizing beam splitter (PBS), a two-piece cemented lens, a first single lens, a beam splitter, and a second axis orthogonal to the first axis, which are sequentially arranged along the first axis. An LCOS illumination device provided and proximate to the PBS,
The two-piece cemented lens includes a positive lens close to the first single lens and a negative lens close to the PBS,
The first light incident surface of the beam splitter is close to the first single lens, and its optical axis overlaps with the optical axis of the first single lens, and the optical axis of the second light incident surface of the beam splitter is: Orthogonal to the optical axis of the first light incident surface, and the second light incident surface is opposed to the first light exit surface,
The LCOS illumination device illuminates the LCOS display chip so that the LCOS display chip emits virtual image light, and the virtual image light emitted from the LCOS display chip passes through the PBS and the two-piece cemented lens. And refracted by the first single lens, refracted by the first single lens and incident on the beam splitter, and from the second light incident surface of the beam splitter at the first light incident surface of the beam splitter. A prism-type augmented reality display device that is combined with ambient light, passes through the first light exit surface of the beam splitter, and enters the user's eyes.   The prism type augmented reality display device according to claim 1, wherein the first single lens is a positive lens.   The prism type augmented reality display device according to claim 1, wherein an antireflection film is coated on the first light incident surface and / or the second light incident surface. The prism-type augmented reality display device further comprises a polarizing element,
The polarizing element is located on the light exit side of the second light exit surface of the beam splitter, the polarization direction of the polarization element is orthogonal to the polarization direction of the PBS, and the second light exit surface is the first light entrance surface. The prism-type augmented reality display device according to claim 1, which faces each other.   The prism-type augmented reality display device according to claim 1, wherein the first light incident surface and / or the second light incident surface is a concave surface. The beam splitter includes a first prism and a second prism arranged sequentially,
The inclined surface of the first prism and the inclined surface of the second prism are bonded, and the bonding surface is coated with a transflective film to form a separation surface of the beam splitter,
The surface of the first prism that is close to the first single lens and whose optical axis overlaps the optical axis of the first single lens is the first light incident surface,
The surface of the first prism whose optical axis is orthogonal to the optical axis of the first single lens is the first light exit surface,
6. The surface according to claim 1, wherein a surface of the second prism whose optical axis is perpendicular to the optical axis of the first single lens is the second light incident surface. 6. Prism-type augmented reality display device. The beam splitter includes a second prism and a first prism arranged in sequence,
The inclined surface of the second prism and the inclined surface of the first prism are bonded, and the bonding surface is coated with a transflective film to form a separation surface of the beam splitter,
The surface of the second prism that is close to the first single lens and whose optical axis overlaps the optical axis of the first single lens is the first light incident surface,
The surface of the second prism whose optical axis is orthogonal to the optical axis of the first single lens is the second light incident surface, the second light incident surface is a convex surface, and is coated with a transflective film. And
5. The surface according to claim 1, wherein a surface of the first prism whose optical axis is orthogonal to the optical axis of the first single lens is the first light exit surface. 6. Prism-type augmented reality display device.   The prism-type augmented reality display device according to claim 7, wherein the first light exit surface is a concave surface that is concentric with the second light entrance surface and has the same radius of curvature. The LCOS illumination device includes a concavo-convex lens sequentially disposed along the second axis, and a light source device.
The first surface of the concave / convex lens close to the light source device is a concave spherical surface, and the second surface close to the PBS is a convex spherical surface,
The light emitted from the light source device is condensed on the PBS through the concave-convex lens, is polarized by the PBS, and is incident on the LCOS display chip as vertical linearly polarized light. Prism-type augmented reality display device. The prism-type augmented reality display device further includes an aspheric positive lens provided on the second axis and positioned between the concave-convex lens and the PBS,
The aspherical positive lens is emitted from the light source device and refracted by the concave / convex lens, uniformly refracting light to reach the PBS, polarized by the PBS, and incident on the LCOS display chip. The prism-type augmented reality display device according to claim 9.